Table 1 Summary of 2018 AAST spleen injury scale for CT Findings

I

Subcapsular hematoma < 10% surface area; parenchymal laceration < 1 cm depth or capsular tear

II

Subcapsular hematoma 10–50% surface area or hematoma < 5 cm; parenchymal laceration 1–3 cm

III

Subcapsular hematoma > 50% surface area or ruptured subcapsular or intraparenchymal hematoma ≥5 cm; parenchymal laceration > 3 cm depth

IV

Presence of splenic vascular injury or active bleeding confined to the spleen; laceration with vessel involvement resulting in > 25% devascularization

V

Presence of splenic vascular injury with active bleeding beyond the spleen; shattered spleen